R ggplot facet - 共享y轴,多个不同的x轴

时间:2018-06-07 22:16:05

标签: r plot ggplot2 facet

我有一个由3个变量(a,b,c)和一个响应(d)组成的数据集。

    df <- structure(list(a = c(0.9973, 0.9965, 1.002, 1.0019, 1.001, 1.0031, 
1.0005, 1.0009, 1.0007, 0.9977, 1.0004, 1.001, 0.9936, 0.9945, 
1.0056, 1.0004, 0.9969, 0.9977, 1.001, 0.9876), b = c(-4.0841, 
-4.216, -4.1469, -4.1418, -4.1919, -4.1953, -4.3314, -4.1205, 
-4.2449, -4.0841, -4.276, -4.3396, -4.2885, -4.1386, -4.0689, 
-4.2229, -4.3886, -4.2267, -4.0344, -4.6152), c = c(32.04, 18.52, 
26.01, 25.65, 21.44, 22.26, 21.8, 21.6, 17.38, 13.84, 20.19, 
27.66, 20.85, 18.71, 22.18, 17.25, 26.78, 28.08, 25.9, 16.68), 
    d = c(2241, 2231, 2231, 2220, 2218, 2216, 2210, 2204, 
    2202, 2194, 2157, 2028, 1853, 1850, 1770, 1755, 1679, 
    1673, 1673, 1645)), .Names = c("a", "b", "c", "d"), class = "data.frame", row.names = c(NA, 
-20))

我的目标是在facet中使用ggplot2来创建一个公共y轴为d的图,以及三个面分别具有a,b和c的x轴 - 换言之,d vs a,d vs. b,d与c相邻,具有共同的y轴。我的目标的近似值可以在基数R中显示:

par(mfrow=c(1,3))
plot(df$a, df$d)
plot(df$b, df$d)
plot(df$c, df$d)

我想用ggplot做这个,不重复y轴。我见过类似的情节,但它们通常涉及一次重复几次的x轴。我已尝试melt数据(即来自reshape2),但我还没有提出适合我的方向。

在视觉上也希望d对a,d对b和d对c中的每一个都是不同的颜色。

提前感谢您的帮助!

2 个答案:

答案 0 :(得分:3)

你走在正确的轨道上。我们需要将df转换为长格式(例如tidyr::gather),然后使用ggplot::facet_grid来获取所需的图

df <- structure(list(a = c(0.9973, 0.9965, 1.002, 1.0019, 1.001, 1.0031, 
  1.0005, 1.0009, 1.0007, 0.9977, 1.0004, 1.001, 0.9936, 0.9945, 
  1.0056, 1.0004, 0.9969, 0.9977, 1.001, 0.9876), b = c(-4.0841, 
  -4.216, -4.1469, -4.1418, -4.1919, -4.1953, -4.3314, -4.1205, 
  -4.2449, -4.0841, -4.276, -4.3396, -4.2885, -4.1386, -4.0689, 
  -4.2229, -4.3886, -4.2267, -4.0344, -4.6152), c = c(32.04, 18.52, 
  26.01, 25.65, 21.44, 22.26, 21.8, 21.6, 17.38, 13.84, 20.19, 
  27.66, 20.85, 18.71, 22.18, 17.25, 26.78, 28.08, 25.9, 16.68), 
      d = c(2241, 2231, 2231, 2220, 2218, 2216, 2210, 2204, 
      2202, 2194, 2157, 2028, 1853, 1850, 1770, 1755, 1679, 
      1673, 1673, 1645)), 
  .Names = c("a", "b", "c", "d"), 
  class = "data.frame", row.names = c(NA,-20))

library(tidyverse)

df_long <- df %>% 
  gather(key, value, a:c)

ggplot(df_long, aes(x = d, y = value, color = key)) +
  geom_point() +
  facet_grid(~ key) +
  theme_bw()

ggplot(df_long, aes(x = d, y = value, color = key)) +
  geom_line() +
  facet_grid(~ key)+
  theme_bw()

ggplot(df_long, aes(x = d, y = value, color = key, fill = key)) +
  geom_col() +
  facet_grid(~ key)+
  theme_bw()

reprex package(v0.2.0)创建于2018-06-07。

答案 1 :(得分:0)

谢谢Tung和Amanda让我走上正轨。关键是使用facet_wrap而不是facet_grid。一旦数据采用如上所述的正确长格式:

library(tidyverse) 
df_long <- df %>% 
   gather(key, value, a:c)

那么这个版本可以解决问题:

ggplot(df_long, aes(x = value, y = d, color = key)) +
    geom_point() +
    facet_wrap(~ key, scales="free_x")